def plot_arc_test(self, fig, *args, **kw):
b = Bloch(fig=fig)
b.add_arc(*args, **kw)
b.render()
def test_arc_errors(self, start, end, err_msg):
b = Bloch()
with pytest.raises(ValueError) as err:
b.add_arc(start, end)
assert str(err.value) == err_msg